I question this standard response to dollar devalutation. So little of the economy is driven by exports as we've exported manufacturing overseas.
I believe that exports are no more than 5% of GDP and of course the offset to decreased costs of exports is the increased costs of imports, which are far more substantial and have the potential to be far more damaging to the economy than any offsetting benefit from exports.
Now, a good portion of our imports are from China who, at least for now, appear committed to pegging the Yuan to the $. To a lesser extent, the same could be said for Japan. So that's okay, but not all goods are from countries determined to devalue with the dollar and then of course there is the elephant in the room: oil.
The other issue is at some point foreign central banks are going to have to allow their currencies to appreciate against the $ or risk out of control inflation. When/if that happens, imports will get very expensive.